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Radiochemistry and Nuclear Chemistry self-test # 21

Comprises Chapter 21

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se 


Question # 1 (Answers in Table form) The Figure below shows the steps used in production of uranium based fuel pins? Mark in the Table below the operations that corresponds to the blue letters in the Figure.

Operation A B C D E F G
Blending
Filtering
Loading
Pressing
Precipitation
Reduction
Sintering

 

 


Question # 2 (One answer) The zircaloy can of fuel pins in a LWR begin to oxidize rapidly at a surface temperature of about

    A) 1000 C
    B) 1200 C
    C) 1500 C
    D) 2000 C
    E) 2800 C

Question # 3 (One answer) Ceramic fuel is produced in the shape of small cylindrical bodies. These are called fuel

    A) bugs
    B) ingots
    C) pellets
    D) pins
    E) rods

Question # 4 (One answer) The most used nuclear fuel is based on

    A) a mixture of U and Pu dioxides
    B) thorium dioxide
    C) uranium dioxide
    D) uranium carbide
    E) uranium nitride

Question # 5 (One answer) The flow rate of water through porous media can be calculated from

    A) the general law
    B) Darcy's lag
    C) Henry's lag
    D) Raoult's lag
    E) the Monte-Carlo-equation

Question # 6 (One or more answers) The term partitioning is used for

    A) the separation of 235U from 238U
    B) a step where Pu and U are separated from each other
    C) the steps involved in the production and purification of uranium from ores
    D) a separation of the most hazardous products from HLW
    E) the separation of precipitated UO2C2O4 from its mother liquor

In case of an error in the answers above, please click on this button before making any corrections 

Question # 7 (One answer) In the production of nuclear fuel, the un sintered small cylinders of UO2 are designated as

    A) brown
    B) green
    C) immature
    D) juvenile
    E) young

Question # 8 (One answer) In order to be able to compare compositions of different nuclear fuels, the burn-up value is normally given per kg (or tonne) of

    A) Crud
    B) FP:s
    C) Fuel
    D) IHM
    E) Uranium

Question # 9 (One answer) The main reason why the planned Swedish final repository for spent nuclear fuel according the the KBS design would be located at a depth of 500 in granite is

    A) that it should be difficult to deposit the fuel
    B) to make the repository very expensive to build
    C) to prevent the use of the remaining fuel by future generations
    D) to guard against the possible erosion during coming ice ages
    E) the low risk of large earth quakes at this depth

Question # 10 (One answer) The Talspeak and Reversed Talspeak processes are based on the use a special water soluble complexing agent. This chemical is called

    A) AMOX
    B) DTPA
    C) EDTA
    D) HDEHP
    E) NTA

Question # 11 (One or more answers) Reprocessing of spent nuclear fuel from LWR:s is today made

    A) in order to remove FP:s from remaining fissile material
    B) because it is so inexpensive
    C) in order to produce more weapons material
    D) in order to recover plutonium
    E) in order to recover remaining uranium

In case of an error in the answers above, please click on this button before making any corrections 

Question # 12 (One answer) High level solid waste originates in the Purex process at the

    A) chopper
    B) dissolver
    C) evaporator for ILW
    D) stack
    E) TBP clean-up unit

Question # 13 (One or more answers) Large plants for reprocessing of spent nuclear fuel are operating within the European Union. These are situated at

    A) Aldermaston
    B) LaHague
    C) Mol
    D) Sellafield
    E) Westinghouse

In case of an error in the answers above, please click on this button before making any corrections 

Question # 14 (One answer) In judging the potential hazard from radioactive waste, so called hazard indices are sometimes used. One such index is based on ALI values. The implicit assumption is then that

    A) all waste is inhaled by humans as a powder
    B) all waste is ingested by humans
    C) all waste sooner or later ends up in the ocean
    D) all the waste is spread uniformly in nature
    E) the waste is abandoned before deposition in a repository

Question # 15 (One answer) What is the main reason for the use of < 0.7% of the energy content in freshly mined natural uranium to produce energy in LWR:s?

    A) Nuclear power reactors use a Carnot cycle
    B) Cooling water is too hot during spring, summer, and fall
    C) These reactors all use thermal neutrons
    D) Thermal efficiency is much lower than in other types of power plants
    E) Uranium is enriched before production of the fuel elements

Question # 16 (One answer) According to the Swedish KBS-method, spent fuel will be encapsulated in an outer container made out of

    A) Aluminum
    B) Lead
    C) Iron
    D) Copper
    E) Zinc

Question # 17 (Answer in Tabular form) Spent fuel are transported in special transport containers. The Figure below shows such a container. Mark in the Table the correspondence between the blue letters in the Figure and the different parts.

 

Part A B C D E
Fuel elements in boxes
Jacket
Neutron shield
Shock absorber
Steel shielding

 


Question # 18 (One or more answers) There are in principle several types of "fuel cycles". Which of the following are names of so called "fuel cycles"?

    A) Breeder cycle
    B) Heterogeneous recycle
    C) Homogeneous cycle
    D) Uranium once through
    E) Uranium plutonium recycle

In case of an error in the answers above, please click on this button before making any corrections 

Question # 19 (One answer) Today, the most common use of 241Am is for production of

    A) armour piercing bullets
    B) RTG:s
    C) small neutron sources
    D) smoke detectors
    E) zircaloy

Question # 20 (One answer) Nuclear fuel produced from blended uranium and plutonium dioxides is called

    A) AOX
    B) MOX
    C) POX
    D) UOX
    E) ZOX

Correct answers to each question can be obtained by clicking on the corresponding button below

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(Updated 2001-08-27)